EEG power changes reflect distinct mechanisms during long‐term memory retrieval

Khader, Patrick H.; Rösler, Frank

doi:10.1111/j.1469-8986.2010.01063.x

Cited by 79 publications

(84 citation statements)

References 47 publications

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“…A number of previous studies have shown that frontal theta power varies as a function of interference in response conflict tasks Cavanagh et al, 2009) and more specifically during episodic memory retrieval (Khader and Rösler, 2011). For instance, higher levels of theta power are obtained during competitive retrieval when compared to noncompetitive memory retrieval .…”

Section: Discussionmentioning

confidence: 98%

“…Decreased alpha power is considered to reflect the higher excitability of cell assemblies in sensory areas, allowing facilitated processing of target information in selective attention and working memory (e.g., Sauseng et al, 2005; Thut et Lundqvist et al, 2011) and indicating material-specific sensory reactivation of long-term memories (Khader and Rösler, 2011). A larger decrease in this frequency range has been observed in high load and interference conditions (Khader and Rösler, 2011;Lundqvist et al, 2011). Parallel effects are evident in our data and presumably indicate the effortful reactivation of neural populations housing sensory features of episodic memories.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Alpha/Beta Oscillations Indicate Inhibition of Interfering Visual Memories

Waldhauser

Johansson²,

Hanslmayr³

2012

J. Neurosci.

164

107

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Selective retrieval of a specific target memory often leads to the forgetting of related but irrelevant memories. Current cognitive theory states that such retrieval-induced forgetting arises due to inhibition of competing memory traces. To date, however, direct neural evidence for this claim has not been forthcoming. Studies on selective attention suggest that cortical inhibition is mediated by increased brain oscillatory activity in the alpha/beta frequency band. The present study, testing 18 human subjects, investigated whether these mechanisms can be generalized to selective memory retrieval in which competing memories interfere with the retrieval of a target memory. Our experiment was designed so that each cue used to search memory was associated with a target memory and a competitor memory stored in separate brain hemispheres. Retrieval-induced forgetting was observed in a condition in which the competitor memory interfered with target retrieval. Increased oscillatory alpha/beta power was observed over the hemisphere housing the sensory representation of the competitor memory trace and predicted the amount of retrieval-induced forgetting in the subsequent memory test. These results provide the first direct evidence for inhibition of competing memories during episodic memory retrieval and suggest that competitive retrieval is governed by inhibitory mechanisms similar to those employed in selective attention.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Alpha/Beta Oscillations Indicate Inhibition of Interfering Visual Memories

Waldhauser

Johansson²,

Hanslmayr³

2012

J. Neurosci.

164

107

View full text Add to dashboard Cite

show abstract

“…The theta activity is also higher during encoding than retrieval, being related more to the access of a stored code than to more general processes (Klimesch et al, 2001). On the other hand, the alpha activity seems functionally related to the activation of stored information, and both the alpha power decrease and the theta power increase are functionally independent (Khader and Rösler, 2010). Our results, in showing that success/ failure of dream recall is related to specific cortical EEG activity and oscillations during the sleep stage preceding awakening, also suggest that the intrinsic differences in the basic electrophysiology of the NREM stage 2 and REM sleep may determine which cortical EEG oscillation (i.e., frontal theta or right temporal alpha) is predictive of dream recall after awakening.…”

Section: Nrem Dream Recallmentioning

confidence: 99%

Recalling and Forgetting Dreams: Theta and Alpha Oscillations during Sleep Predict Subsequent Dream Recall

Marzano

Ferrara²,

Mauro³

et al. 2011

J. Neurosci.

118

159

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Under the assumption that dream recall is a peculiar form of declarative memory, we have hypothesized that (1) the encoding of dream contents during sleep should share some electrophysiological mechanisms with the encoding of episodic memories of the awake brain and (2) recalling a dream(s) after awakening from non-rapid eye movement (NREM) and rapid eye movement (REM) sleep should be associated with different brain oscillations. Here, we report that cortical brain oscillations of human sleep are predictive of successful dream recall. In particular, after morning awakening from REM sleep, a higher frontal 5-7 Hz (theta) activity was associated with successful dream recall. This finding mirrors the increase in frontal theta activity during successful encoding of episodic memories in wakefulness. Moreover, in keeping with the different EEG background, a different predictive relationship was found after awakening from stage 2 NREM sleep. Specifically, a lower 8 -12 Hz (alpha) oscillatory activity of the right temporal area was associated with a successful dream recall. These findings provide the first evidence of univocal cortical electroencephalographic correlates of dream recall, suggesting that the neurophysiological mechanisms underlying the encoding and recall of episodic memories may remain the same across different states of consciousness.

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“…In particular, theta-band (4-8 Hz) activity has often been observed in relation to memory processes (e.g., Jacobs, Hwang, Curran, Kahana, 2006;Khader & Rösler, 2011; see for reviews Düzel, Penny, & Burgess, 2010;Klimesch, 1999;Nyhus & Curran, 2010), also involving the retrieval of lexical-semantic information during language comprehension (e.g., Bastiaansen et al 2005Bastiaansen et al , 2008. Oscillations in the alpha band (8-15…”

Section: Introductionmentioning

confidence: 99%

“…This oscillatory activity is typically categorised into different frequency bands. Different cognitive functions have been associated with frequency-specific changes in oscillatory power (e.g., Engel & Fries, 2010;Hanslmayr, Staudigl, & Fellner, 2012;Jensen & Mazaheri, 2010;Khader & Rösler, 2011;Van Ede, de Lange, Jensen, & Maris, 2011).…”

Section: Introductionmentioning

confidence: 99%

Oscillatory brain responses in spoken word production reflect lexical frequency and sentential constraint

2014

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Two fundamental factors affecting the speed of spoken word production are lexical frequency and sentential constraint, but little is known about their timing and electrophysiological basis. In the present study, we investigated event-related potentials (ERPs) and oscillatory brain responses induced by these factors, using a task in which participants named pictures after reading sentences.Sentence contexts were either constraining or nonconstraining towards the final word, which was presented as a picture. Picture names varied in their frequency of occurrence in the language.Naming latencies and electrophysiological responses were examined as a function of context and lexical frequency. Lexical frequency is an index of our cumulative learning experience with words, so lexical-frequency effects most likely reflect access to memory representations for words. Pictures were named faster with constraining than nonconstraining contexts. Associated with this effect, starting around 400 ms pre-picture presentation, oscillatory power between 8-30 Hz was lower for constraining relative to nonconstraining contexts. Furthermore, pictures were named faster with high-frequency than low-frequency names, but only for nonconstraining contexts, suggesting differential ease of memory access as a function of sentential context. Associated with the lexicalfrequency effect, starting around 500 ms pre-picture presentation, oscillatory power between 4-10 Hz was higher for high-frequency than for low-frequency names, but only for constraining contexts.Our results characterise electrophysiological responses associated with lexical frequency and sentential constraint in spoken word production, and point to new avenues for studying these fundamental factors in language production.

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EEG power changes reflect distinct mechanisms during long‐term memory retrieval

Cited by 79 publications

References 47 publications

Alpha/Beta Oscillations Indicate Inhibition of Interfering Visual Memories

Alpha/Beta Oscillations Indicate Inhibition of Interfering Visual Memories

Recalling and Forgetting Dreams: Theta and Alpha Oscillations during Sleep Predict Subsequent Dream Recall

Oscillatory brain responses in spoken word production reflect lexical frequency and sentential constraint

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